diff --git a/.ruby-version b/.ruby-version
index 58594069..79a61441 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.2.3
+2.4.4
diff --git a/.travis.yml b/.travis.yml
index 53a38a0e..920546c0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,9 @@ cache:
 notifications:
   email: false
 rvm:
-  - 2.3.0
-  - 2.2.2
+  - 2.4.4
+  - 2.3.7
+  - 2.2.10
   - jruby-9.0.3.0
 install: bin/setup_ci
 before_script:
diff --git a/bin/setup_ci b/bin/setup_ci
index 07233971..26e7c68d 100755
--- a/bin/setup_ci
+++ b/bin/setup_ci
@@ -18,4 +18,6 @@ nvm alias default "$NODE_JS_VERSION" || true
 
 node --version
 
+gem update --system
+
 source bin/setup